Heater for rolls



Q 1644,069 1927' R. L. MCENTOSH HEATER FOR ROLLS Oct. 4 1 2 1 1,644,069

9 7 R. L. M INTOSH HEATER FOR ROLLS Filed Dec. :5, 1924 2 Sheets-Sheet 2 5206f?? JZOber-Z L M I 22b5, 4 111E655 Patented Oct. 4, 1927.

UNITED STATES v 1,644,069 PATENT OFFICE.

ROBERT L. MOIMOSH,OF INDIANA HARBOR, INDIANA, ASSIGNOR 'IO INLAND STEEL COMPANY, OF CHICAGO, ILLINOIS, A; CORPORATION OF DELAWARE.

HEATER FOR ROLLS.

Application filed December 3, 1924. Serial No. 753,660.

The present invention relates to heaters for rolls. I

More particularly the present inventlon relates to means for heating rolls such as are used in sheet mills. Various means have been devised and are being used for accomplishing such heating. "The present invention relates to electrical heating means and has for one of its objects the prov1s1on of electrical heating means which will have mproved efliciency and economy in operation.

A further object is to provide electr cal heating means in which the magnetlzing effect of the heating means upon the rolls will be a minimum.

A further object is'to provide an electrical heating structure for heating rolls in which the magnetizing eifect will be a mlnlmum and which will involve a minimum of expense for' repairs. a

' A further object is to provide heating means for rolls which will minimize the magnetizing effect of the electrical heatlng current upon the rolls while retaining the advantage that said heating coils may be placed in close proximity to the heating rolls.

A further object is to provide an improved method of applying the heating current, whereby the magnetizing effects of said current will be minimized.

Further objects will appear as the description proceeds. j Referring to the drawings--, Figure 1 is a view in elevation of a roll heating structure, the rolls to be heated being shown in transverse section;

Figure 2 is a view on an enlarged scale of a portion of the structure shown-in Fig- Figure 3 is a fragmentary'view illustrating the heating structure applied to rolls to be heated, said view being "taken in side elevation;

Figure 4 is a detail view, parts being broken away, showing'one of the' heating elements; v I

Figure 5 is a sectional view taken along the plane indicated by the arrows 5-5 of- 5 Figure 4;

Figure 6 is a diagrammatic view illusk trating the electrical connections of the heating elements; and

Figure 7 is a. view illustrating the relative spacing of electrical resistor wire with tion of one will be sufficient for the description of both. The heating members A and B comprise a frame 14 of angle members, from which the handles 1515 extend at the upper ends. Said heating members are pro-v vided at their lower ends with outstanding portions provided with the rollers 16-16,

by means of which said members may be I trundled about from place to place. The heating members A and B are clamped together, accordingto the illustrated embodi-' ment, by means of, the bolts 17 and 18 at- I their upper and lower ends, respectively.

Flexible jacket members 19 are secured to the-upper portions of the frame andsimilar jacket members 20 are secured to the lower portion'of the frame, said frames having circumferential curvatures whereby said jackets 19- -19. and 20-20 may conform to the peripheries of the rolls 11 and 12. It will be noted that the jackets 19 and 20 are securedto the frames l t-14 only at their extremities, the intermediate portions of said jackets remaining flexible and free to be drawn into contact with the rolls. Adjusting bolts 21-21 are threaded through cer-- tain relatively fixed frame members 22 22 and are provided with the enlarged ends 2323 engaging the outturned edges 24 and 25 of the jackets 19 and 20.. As shown in detail in Figure 2, the jacket 19 is provided with a lining 26 of asbestos or similar heat insulating material. A plurality of heating elements 27-27 are secured upon the inner faceof the insulatingmaterial 26 and are provided with the connector lugs 27'. As will be explained hereinafter, the several heating elements 27-27 are. connected in parallel circuits to the electric supply-mains, whereby each of said elements carries a fractional part of the total heating current.

Referring now particularly to Fi es 4 and 5, it will be noted that the heating alcturned edges -30. Said casing 28 housesthe resistor wire 32, which according to the present invention is non-induct ively shaped, 1

- that is to say-said resistor wire is folded 33 of resistor wire.

upon itself in the manner shown in Figure' i,

whereby the magnetizing effect of any fold 33 of said resistor wire is balanced by the magnetizing effect of the neighboring fold Said folds 33-33 should be located close to one another, the

space between adjacent folds being less than the space between the resistor wire 32 and the roll to be heated. This spacing is illustrated in Fi ure 7. By reason of this ar-..

rangement o the resistor wire, stray mag netic effects upon the rollsto-be heated are minimized. Not only does the non-magnetizing folding of the resistor wire with its closely spaced foldsminimize the effect of stray magnetic fluxes, but a further protection of the rolls against magnetism is accomplished by reason of the jacket of magnetic material housing the resistor wire 32. It will be understood that the resistor wire may be embedded in cement 34 or other suitable material within the casing 28.

Figure 6 illustrates the electrical connections of the heating elements 27-27. The numerals 35 and 36 .indicate two supply conductors of an electric circuit. As clearly shown in Figure 6, the two terminals of each of the heating elements 27 -27 are connected to the electrical supply conductors 35 and 36, whereby. each of the heating elements 27-27 carries only a fractional part of the total heating current, thereby reducing the intensity of their magnetic effect. A fur- 't-her advantage of this construction is that in the event of failure of any of the heating elements the remainder of said elements will still be operative, whereby the failure of a single element or a few elements will not put the total heater out of operation.

By reason of the present invention the efficient heating of the rolls is accomplished. It will be clear that the jackets 1919 and 20-20 containing the heating elements 2727 may be d'rawntightly against the rolls 11 and 12 or may loosely embrace said rolls, as preferred. The magnetizing effects upon the rolls will be reduced to a minimum and the dangenof shut downs due to failure of any of the elements will be minimized.

Though a preferred embodiment of the present invention has been described in detail, it will"be clear that many modifications will occur to those skilled in the art. It is intended to cover all such modifications that fall within the scope of the appended claim.

What is claimed is:

A heater \for rolls, comprising a plurality of heating elements, means for holding said elements adjacent to the periphery of the roll to be heated, each of said elements including a resistor wire, said wire being folded upon itself in a non-magnetizing manner, the

folds of said wire being relatively close to- 4 gether with respect to the distance to the roll.

Signed at Indiana Harbor, Indiana, this 

